隧道掘进机主轴密封系统性能的研究

通过对隧道掘进机主轴的油封工作状态进行有限元仿真，研究了油封在不同初始过盈量和工作油压下的密封性能。结果表明:该密封系统油封与轴之间的最大接触应力始终大于工作油压，可以保证油封的密封性能；油封与轴的接触应力呈线性锥形分布，最大接触应力几乎处于接触宽度的中间，影响油封的吸油能力，不利于油封的密封；适当减小油封初始过盈量有利于减少密封处主轴的磨损，提高油封的使用寿命。;Based on finite element simulation of the main bearing oil seal for tunnel boring machine under working state，the sealing performance of the oil seal was investigated under different initial interference and working pressure.It was found that，for the sealing system，the maximum contact stress between the oil seal and shaft was always greater than the working oil pressure，which could ensure the sealing performance of oil seal. The contact stress distribution was linear (cone-shape) and the maximum contact stress was almost in the middle part，which affected the oil absorption ability of the oil seal and would reduce the sealing performance.The simulation results indicated that properly reducing the initial interference could decrease shaft wear on the sealing position and improve the service life of the oil seal